| Health / Medical Topics |
Trisomy
Definition 1
A chromosomal abnormality consisting of the presence of one chromosome in addition to the normal diploid number. (NCI Thesaurus)
Definition 2
The presence of an extra chromosome, resulting in a total of three copies of that chromosome instead of the normal 2 copies (e.g., trisomy 21, or Down syndrome). (NCI Dictionary)
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